Blowtorch



retoma im a icas.

naar' rara raar optica.

HDRN G. DONIGAN, OF ST. LOUIS, MISSOURI.

BLow'roReH.

Application led March 6, 1920. Serial No, 363,869.

To all whom it may conocen.:

Be it known that I, HORN G. DONIGAN, a citizen of the United States, residing at the'cityof St'. Louis and State of Missouri,

` haveinvented a new and useful Blowtorch, of which the followingl is a. specification.

' .tion of the vinvention taken in' connection of the gases for instance, in an oxygen acety lene torch, a passage for the oxygen ;v the gas with the accompanying drawing, in which Fig. 1 is'an elevation vshowing the torch construction.

Fig. 2 is a vertical section through the head of the torch.

Fig. 3 is a cross section taken substantially on the line 3-3 of Fig. 2.

The invention as illustrated in the drawing is shown as including `a handle section liwhich may be of any suitable form, but

ypreferably in'the form of a casting *having 'separate passageways .2 'and 3 respectively therethrough, said passagewaysbeing con'- trolled by valves 4 and 5 respectively. The passageway 2 constitutes a conduitfor one being supplied thereto through a flexible tube connected with the source of. supply.-

The passage 3 constitutes a conduit for the other gas, that is in an oxygen acetylene torch, a passage for the acetylene; the gas being supplied through a ieXible tube 7 con` nected into the end of the passage 3.

A tube 8 connects with the front end of the passage 2 and extends forwardly some distance of `the handle, and a tube 9 connects into the forwardend ofl the passage.

3 and extends forwardlysome distance of the handle.- It will be understood that the j volume and pressure of the gases may beindependently cont-rolled by means of the valves 4 and. K The head of the'torch includes a tubular cylindrical casing 10 provided with hollow bosses 1 1 and 12, the passage ways 13 and 14 through the bosses 11 and 12 constituting inlet openings for the passage of the gases into the mixing chamber'. The passages 13 and v14: are preferably arranged in vertical alinement and vspaced apart, the upper passage entering the casing 10 near the top thereof, and the passage '14 entering the casing at some distance below the pas- I sage 13.

A hollow stem 15, constituting a nozzle, is adapted to be inserted in the low-er end of the casing 10, 'and tobe heldin place therein by threaded engagement, the upper head 16 of the stem being externally threadedto fit an internally threaded portion 17 of the casing 10.

It will be observed that when the stem 15 isj in place the upper end thereof terminates slightly below the opening .13, so that there y will be a free passage of thegas through the opening 13 into the nozzle passage 18. The stem 15 is provided with a flange 19 that 'has its upper face beveled to form a cone seat so that` a tight joint will be effected at the .lower end of the chamber 10 when the stem 15 is. screwed in place. The stem 15- at its lower extremity is provided with an extefr-iorly threaded portion 2O for receiving a the torch.

The upper end of the chamber 10 is closed by a removable screw plug 22 that threads into-the upper end of the chamber 10. The

screw plug 22 has a `flange 23 that fits tightly against the upper end of the chamber providing a sealed ground joint preventing the rescape of the gas from .the mixing chamber. The lower face of the screw plug `22 'is preferably' provided with a concave recess 24, thereby forming a chamber above -the inlet opening 13. Thus, whenever there kis an obstruction'at the outlet end of the torch thecolumn of gas admitted through the opening 13 V will cushion back into the chamber above the opening and prevent back fire in the conduit 8.

The stem 15 has a recessed portion 25 so that a chamber is formed between the inner removable torch tip 21., it being understood lthat varying types of tips may be applied to wall ofthe casing 1() and the stem at a point substantially midway\'of the length of the chamber 10. The chamber thus formed is in registration with the inlet openin0r 1li. The gas from theconduit 9 enters this c am- 26 into the passage d8 at a point some dis'` tance below the top thereof. 4 y

In practice for welding operations, the

torch is preferably supplied with a mixture `ber and' passes therefrom through openingsA the use ot'such gases.

gen gas enters from the conduit 8 through of oxygen and acetylene gas, although it will be understood that it is not limited' to The column of oxythe passage 13, the pressure being regulated according to operative requirements by t-he valve 4. The column of gas passes through the opening 18 having an1 aspirator orsuc- `tion effect, causing at least a partial vacuum in the chamber 9A above the inlet 13. The acetylene gas is admitted through the passage 14 into the chamber' formed by the recess, from whence it passes through the ports 26 thoroughly mixing with the incoming column of the oxygen gas as it passes the ports 26. Thus the two gases are thoroughly mixed producing a combustive mixture that burns with a iiame of high- It, by any rea` degree ot' heat at the tip. son, the outlet or tip is obstructed, the in* coming column oi' oxygen above the inlet of the acetylene prevents any back-fire into radially into said casing adjacent to one yend thereof, an additional gas inlet tube connected lwith and opening radially into said casing between the iirst tube and the opposite end of the casing, threads formed on the inner wall of the casing between said tubes, a .Stem extending into the casing and terminating -between Said two linlet tubes, a removable plug extending into the casing and having its end in alinement 'with and spaced from said' stern, threads on the inner .end of said stem engaging the threads in Ipassages through the wall of the stem forming communications from said chamber to the passage through the stem.

A2. A blow torch, comprising a casing, a gas inlet tube opening into said casing ,adj acent to one` end thereof, an additional gas inlet tube opening. into said casing between the irst tube and theopposite end ot' the casing, threads formed on the inner wallY ot the Acasing between said tubes, a tubular stem ,extending into the casing and terminating between said tubes, threads on the inner end of said stem engaging the threads in the casing, a removable plug extending into the casing and leaving a radial lcornimunication with the first tube from the space between said plug and the end of the stem, an abutment engaging the end of th`e casingy and limiting inward movement ot' the stem into the casing, an annular chamber between said-stem and the wall of the casing in communication with the second tube, radial passages through the wallA of the stem forming communications from said chamber to the inside of the stem,

and aI torch tip removably supported by lthe outer lend ofthe stem having a'passage therethrough in communication with the passage through the stem.

HORN G. DGNIGAN. 

